CN109142880A - The quasi- on-Line Monitor Device and method of CCM flyback converter output capacitance - Google Patents
The quasi- on-Line Monitor Device and method of CCM flyback converter output capacitance Download PDFInfo
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- CN109142880A CN109142880A CN201710508755.6A CN201710508755A CN109142880A CN 109142880 A CN109142880 A CN 109142880A CN 201710508755 A CN201710508755 A CN 201710508755A CN 109142880 A CN109142880 A CN 109142880A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/64—Testing of capacitors
Abstract
The invention discloses a kind of quasi- on-Line Monitor Device of CCM flyback converter output capacitance and methods.The device includes Flyback converter main power circuit, driving circuit, display unit, capacitor known to parameter, Current Mutual Inductance isolation amplifying unit and signal processing module, and wherein signal processing module includes power circuit control, switching frequency fsIt calculates, duty ratio D is calculated, output voltage sampling, capacitance current triggering samples, capacitor ESR and C calculate six units.This method are as follows: the PWM driving pulse signal of detection switch pipe, it handles to obtain switching frequency and duty ratio through ON signal processing module, detection output average voltage, and shunt capacitance known to upper parameter, it is isolated by current transformer and amplifies, sampling obtains the instantaneous value of shunt capacitance electric current, and above-mentioned data processing is obtained the value of output filter capacitor current ESR and C.The present invention does not need to remove the capacitor in converter, and the life prediction for capacitor and power supply provides foundation.
Description
Technical field
The invention belongs to the monitoring technical field in electrical energy changer, especially a kind of CCM flyback converter output electricity
The quasi- on-Line Monitor Device and method held.
Background technique
Due to the advantages that high-efficient, small in size, Switching Power Supply is applied very extensive in daily production and life.It is general and
It says, in order to obtain relatively stable output voltage, it is necessary to which high-frequency noise is effectively filtered out using capacitor.Converter work a period of time
Later, the capacitance (Capacitance, C) of capacitor and equivalent series resistance (Equivalent Series Resistance,
ESR it) can change, compared with initatial capacitance value C and resistance value ESR, when the variable quantity is larger, i.e., it is believed that the capacitor has lost
Effect, the failure of capacitor will will cause the operation troubles of power supply and system.It is depressured (Buck), boosting (Boost), buck (Buck-
Boost) converter is three kinds of most basic switching power converters, and other converters can be developed by these three converters
?.Wherein, CCM (Continuous Current Mode, continuous current mode) Flyback converter computer power supply,
The fields such as communication power supply, aerospace are widely used, therefore monitor the ESR of the output filter capacitor of CCM Flyback converter
And C, predict that its service life is extremely important.But monitor the ESR and C of the output filter capacitor of CCM Flyback converter at present
Method generally requires to remove the capacitor in converter, can not ESR the and C value real-time and efficiently to capacitor monitor on-line.
Summary of the invention
The purpose of the present invention is to provide a kind of quasi- on-Line Monitor Device of CCM flyback converter output capacitance and method,
It is capable of the variation of the capacitance C of real-time monitoring equivalent series resistance ESR and capacitor, it is accurate to carry out to the service life of electrolytic capacitor and power supply
Prediction.
The technical solution for realizing the aim of the invention is as follows: a kind of quasi- on-line monitoring of CCM flyback converter output capacitance
Device, including capacitor known to Flyback converter main power circuit, driving circuit, display unit, parameter, Current Mutual Inductance every
From amplifying unit and signal processing module, the signal processing module includes power circuit control unit, switching frequency fsIt calculates
Unit, duty ratio D computing unit, output voltage sampling unit, capacitance current triggering sampling unit, capacitor ESR and C calculate list
Member；
The Flyback converter main power circuit includes input voltage source Vin, switching tube Qb, sustained diodeb, coupling
Close inductance L, output filter capacitor and load RL, the output filter capacitor includes equivalent series resistance ESR and capacitor C, wherein
Switching tube QbDrain electrode and voltage source VinAnode connection, coupling inductance L primary side one end and switching tube QbDrain electrode connection, coupling
The different name end on the end pair side inductance L and sustained diodebAnode connection, the coupling inductance L primary side other end and voltage source Vin's
Cathode connection, sustained diodebCathode respectively with one end of equivalent series resistance ESR and load RLOne end connection, it is equivalent
The other end of series resistance ESR is connect with one end of capacitor C, the other end and load R of capacitor CLThe other end with couple electricity
The Same Name of Ends connection for feeling L pair side, loads RLBoth ends are output average voltage Vo；
The input terminal of the power circuit control unit voltage source V with Flyback converter main power circuit respectivelyinWith
Export average voltage VoConnection, the pwm signal of power circuit control unit output end are respectively connected to switching frequency fsComputing unit and
Duty ratio D computing unit, the output average voltage V of Flyback converter main power circuitoOutput voltage sampling unit is accessed,
It is single that the pwm signal of Current Mutual Inductance isolation amplifying unit and power circuit control unit output end accesses capacitance current triggering sampling
Member, switching frequency fsComputing unit, duty ratio D computing unit, output voltage sampling unit and capacitance current trigger sampling unit
Output end access capacitor ESR and C computing unit, the output end of capacitor ESR and C computing unit accesses display unit；
The input terminal of the driving circuit is connect with the pwm signal of power circuit control unit output end, driving circuit
Output end accesses switching tube QbGate pole.
Further, the signal processing module is dsp chip TMS320F28335.
Further, the display unit is 1602 liquid crystal displays.
A kind of quasi- on-line monitoring method of CCM flyback converter output capacitance, comprising the following steps:
Step 1, the capacitor known to an output end upper parameter in parallel, creates power circuit control in signal processing module
Unit processed, switching frequency fsComputing unit, duty ratio D computing unit, output voltage sampling unit, capacitance current triggering sampling are single
Member, capacitor ESR and C computing unit；
Step 2, the output of the power circuit control unit acquisition Flyback converter main power circuit of signal processing module
Average voltage VoWith input voltage Vin, obtain pwm signal and through driving circuit driving switch pipe Qb；
Step 3, the pwm signal of power circuit control unit output is sent into switching frequency fsComputing unit and duty ratio D meter
Unit is calculated, through switching frequency fsComputing unit processing obtains the current switching frequency f of converters, at duty ratio D computing unit
Reason obtains the current duty ratio D of converter；
Step 4, the output average voltage V of Flyback converter main power circuitoIt is sent into output voltage sampling unit, is obtained
To output average voltage；
Step 5, the capacitance current i of the pwm signal of power circuit control unit output and Current Mutual Inductance isolation amplifying unitx
It is sent into capacitance current and triggers sampling unit, handle to obtain the instantaneous value i of capacitance current by delay procedurex(DTs)、ix[(1+9D)
Ts/10]、ix[(2+8D)Ts/10]、ix[(3+7D)Ts/10]、ix[(4+6D)Ts/10]、ix[(5+5D)Ts/10]、ix[(6+4D)
Ts/10]、ix[(7+3D)Ts/10]、ix[(8+2D)Ts/10]、ix[(9+D)Ts/10]、ix(Ts) totally 11 value, TsFor converter
Switch periods；
Step 6, the switching frequency f that will be obtaineds, duty ratio D, output average voltage VoAnd the instantaneous value i of capacitance currentx
(DTs)、ix[(1+9D)Ts/10]、ix[(2+8D)Ts/10]、ix[(3+7D)Ts/10]、ix[(4+6D)Ts/10]、ix[(5+5D)
Ts/10]、ix[(6+4D)Ts/10]、ix[(7+3D)Ts/10]、ix[(8+2D)Ts/10]、ix[(9+D)Ts/10]、ix(Ts) be sent into
Capacitor ESR and C computing unit (10) carry out curve fitting and integrated treatment, obtains output filter capacitor in Flyback converter
The value of current equivalent series resistance ESR and capacitor C；
Step 7, the value of resulting equivalent series resistance ESR and capacitor C is sent by capacitor ESR and C computing unit shows list
First real-time display.
Further, the Fitting curve equation of ESR and C computing unit described in step 6 should be as follows:
Acquire X1、X2、X3And iCx(0)；iCxIt (0) is the initial instantaneous value of capacitance current, t is the time；
It is as follows then according to the formula of the integrated treatment of ESR and C computing unit described in step 6:
In formula, ESR is the resistance value of equivalent series resistance, and C is the capacitance of capacitor, LsFor coupling inductance pair side inductance value, VoIt is defeated
Average voltage out, resistance value of the ESRx for the equivalent series resistance of institute's shunt capacitance, capacitance of the Cx for institute's shunt capacitance, X1、X2、X3
For the parameter of matched curve.
Compared with prior art, the present invention and remarkable advantage are as follows: (1) do not need to remove the capacitor in converter；(2) standard exists
Line monitors ESR the and C value of capacitor, and the life prediction for capacitor and power supply provides foundation.
Detailed description of the invention
Fig. 1 is the work wave in the CCM Flyback converter switches period.
Fig. 2 is the monitoring method schematic diagram of CCMFlyback converter output capacitance ESR and C of the present invention.
Wherein: VinInput voltage, IinInput current,Coupling inductance primary current,Coupling inductance pair side electricity
Stream, iCCapacitance current, iCxShunt capacitance electric current, IoExport electric current, VoExport average voltage, QbSwitching tube, Db- two poles
Pipe, L- coupling inductance, C- output filter capacitor value, ESR- equivalent series impedance, the capacitance of Cx- shunt capacitance, ESRx- is simultaneously
Join the equivalent series impedance of capacitor, RLLoad, VgsSwitching tube QbDriving voltage, D- duty ratio, the t- time, fsConverter
Switching frequency, Δ ILInductive current ripple peak-to-peak value, vESRVoltage on equivalent series resistance, vCVoltage on capacitor.
Specific embodiment
With reference to the accompanying drawing and specific embodiment makes further description to the present invention.
The present invention designs a kind of quasi- on-line monitoring and works in inductor current continuous mode (Continuous Conduction
Mode, CCM) Flyback (Flyback) converter output filter capacitor ESR and C device and method.
1, theory deduction
Fig. 1 is the work wave in the CCM flyback converter switches period.As switching tube QbWhen conducting, diode DbIt cuts
Only, the voltage at coupling inductance L primary side both ends is Vin, coupling inductance primary currentWith Vin/LpSlope linear rise.When opening
Close pipe QbWhen shutdown, coupling inductance secondary currentPass through diode DbAfterflow, at this time the voltage at coupling inductance L pair side both ends be-
Vo, coupling inductance secondary currentWith Vo/LsSlope decline.Since Flyback converter works in CCM mode, opening
Before closing end cycle, coupling inductance electric currentDo not drop to zero.Coupling inductance electric currentBeing averaged in a switch OFF time
Value is
Coupling inductance primary currentAnd secondary currentExpression formula in one cycle is as follows:
Wherein VoTo export average voltage, LpFor coupling inductance primary side inductance value, LsFor coupling inductance secondary inductance value, fs
For the switching frequency of Flyback converter, D is the duty ratio of switching tube, and t is the time.
It can obtain, the electric current and i of two capacitorsC+iCxExpression formula are as follows:
It assume that
a1=0 (4)
b1=-Io (5)
The voltage expression of two capacitors is respectively
Due to the parallel connection of two capacitors, then two capacitance voltages are equal
vC(t)=vCx(t) (10)
WhenWhen,
It can be obtained by formula (11) derivation
Doing Laplace transformation to formula (12) equal sign both sides respectively can obtain
Abbreviation can obtain
Doing Laplace inverse transformation to formula (14) equal sign can obtain
Wherein
Matched curve can be made according to 11 parallel capacitance of value that sampling obtains, obtains X1、X2、X3And iCx(0)。
Wushu (6), (7) substitution (16), (17), (18) can obtain:
In formula, LsFor the inductance value of inductance, ESR is the resistance value of equivalent series resistance, and C is the capacitance of capacitor, VoIt is average to export
Voltage, resistance value of the ESRx for the equivalent series resistance of institute's shunt capacitance, capacitance of the Cx for the capacitor of institute's shunt capacitance, X1、X2、X3
For the parameter of matched curve.
Based on formula (19), (20), the monitoring side of available CCM Flyback converter output filter capacitor ESR and C
Method.
2, the quasi- on-Line Monitor Device and method of CCMFlyback converter output capacitance of the present invention
In conjunction with Fig. 2, the quasi- on-Line Monitor Device of CCM flyback converter output capacitance of the present invention, which is characterized in that including
Flyback converter main power circuit 1, driving circuit 3, display unit 11, capacitor 7 known to parameter, Current Mutual Inductance isolation are put
Big unit 8 and signal processing module, the signal processing module include power circuit control unit 2, switching frequency fsIt calculates single
Member 4, duty ratio D computing unit 5, output voltage sampling unit 6, capacitance current triggering sampling unit 9, capacitor ESR and C calculate list
Member 10；
The Flyback converter main power circuit 1 includes input voltage source Vin, switching tube Qb, sustained diodeb, coupling
Close inductance L, output filter capacitor and load RL, the output filter capacitor includes equivalent series resistance ESR and capacitor C, wherein
Switching tube QbDrain electrode and voltage source VinAnode connection, coupling inductance L primary side one end and switching tube QbDrain electrode connection, coupling
The different name end on the end pair side inductance L and sustained diodebAnode connection, the coupling inductance L primary side other end and voltage source Vin's
Cathode connection, sustained diodebCathode respectively with one end of equivalent series resistance ESR and load RLOne end connection, it is equivalent
The other end of series resistance ESR is connect with one end of capacitor C, the other end and load R of capacitor CLThe other end with couple electricity
The Same Name of Ends connection for feeling L pair side, loads RLBoth ends are output average voltage Vo；
The input terminal of the power circuit control unit 2 voltage source V with Flyback converter main power circuit 1 respectivelyin
With output average voltage VoConnection, the pwm signal of 2 output end of power circuit control unit are respectively connected to switching frequency fsIt calculates single
4 and duty ratio D of member computing unit 5, the output average voltage V of Flyback converter main power circuit 1oAccess output voltage is adopted
The pwm signal of sample unit 6, Current Mutual Inductance isolation amplifying unit 8 and 2 output end of power circuit control unit accesses capacitance current
Trigger sampling unit 9, switching frequency fsComputing unit 4, duty ratio D computing unit 5, output voltage sampling unit 6 and capacitor electricity
The output end of stream triggering sampling unit 9 accesses capacitor ESR and C computing unit 10, the output of capacitor ESR and C computing unit 10
It terminates into display unit 11；
The input terminal of the driving circuit 3 is connect with the pwm signal of 2 output end of power circuit control unit, driving circuit 3
Output end access switching tube QbGate pole.The signal processing module is dsp chip TMS320F28335.The display unit
11 be 1602 liquid crystal displays.
The quasi- on-line monitoring method of CCM flyback converter output capacitance of the present invention, comprising the following steps:
Step 1, the capacitor 7 known to an output end upper parameter in parallel, creates power circuit in signal processing module
Control unit 2, switching frequency fsComputing unit 4, duty ratio D computing unit 5, output voltage sampling unit 6, capacitance current triggering
Sampling unit 9, capacitor ESR and C computing unit 10；
Step 2, the power circuit control unit 2 of signal processing module acquires the defeated of Flyback converter main power circuit 1
Average voltage V outoWith input voltage Vin, obtain pwm signal and through 3 driving switch pipe Q of driving circuitb；
Step 3, the pwm signal that power circuit control unit 2 exports is sent into switching frequency fsComputing unit 4 and duty ratio D
Computing unit 5, through switching frequency fsThe processing of computing unit 4 obtains the current switching frequency f of converters, calculated through duty ratio D single
5 processing of member obtains the current duty ratio D of converter；
Step 4, the output average voltage V of Flyback converter main power circuit 1oIt is sent into output voltage sampling unit 6,
Obtain output average voltage Vo；
Step 5, the capacitance current of power circuit control unit 2 exports pwm signal and Current Mutual Inductance isolation amplifying unit 8
ixIt is sent into capacitance current and triggers sampling unit 9, handle to obtain the instantaneous value i of capacitance current by delay procedurexDTs、ix[1+
9DTs/10]、ix[2+8DTs/10]、ix[3+7DTs/10]、ix[4+6DTs/10]、ix[5+5DTs/10]、ix[6+4DTs/10]、ix
[7+3DTs/10]、ix[8+2DTs/10]、ix[9+DTs/10]、ixTsTotally 11 values, TsFor the converter switches period；
Step 6, the switching frequency f that will be obtaineds, duty ratio D, output average voltage VoAnd the instantaneous value of capacitance current
ixDTs、ix[1+9DTs/10]、ix[2+8DTs/10]、ix[3+7DTs/10]、ix[4+6DTs/10]、ix[5+5DTs/10]、ix[6+
4DTs/10]、ix[7+3DTs/10]、ix[8+2DTs/10]、ix[9+DTs/10]、ixTsBe sent into capacitor ESR and C computing unit 10 into
Row curve matching and integrated treatment obtain the current equivalent series resistance ESR of output filter capacitor in Flyback converter and capacitor
The value of C；
10 Fitting curve equation of ESR and C computing unit should be as follows:
Acquire X1、X2、X3And iCx(0)；iCxIt (0) is the initial instantaneous value of capacitance current, t is the time；
It is as follows then according to the formula of 10 integrated treatment of ESR and C computing unit described in step 6:
In formula, ESR is the resistance value of equivalent series resistance, and C is the capacitance of capacitor, LsFor coupling inductance pair side inductance value, VoIt is defeated
Average voltage out, resistance value of the ESRx for the equivalent series resistance of institute's shunt capacitance, capacitance of the Cx for institute's shunt capacitance, X1、X2、X3
For the parameter of matched curve.
Step 7, the value of resulting equivalent series resistance ESR and capacitor C is sent by capacitor ESR and C computing unit 10 shows
11 real-time display of unit.
The present invention designs a kind of output of efficient stable for the output filter capacitor in CCM Flyback converter
The quasi- on-Line Monitor Device and method of filter capacitor equivalent series resistance ESR and capacitor C, this method can not remove converter
In capacitor in the case of the parameter ESR and C of output capacitance are monitored, the life prediction for capacitor and power supply provides foundation,
Without additional parameter, facilitate realization, there is important practical application value.
Claims (5)
1. a kind of quasi- on-Line Monitor Device of CCM flyback converter output capacitance, which is characterized in that including Flyback converter
Amplifying unit is isolated in main power circuit (1), driving circuit (3), display unit (11), capacitor (7), Current Mutual Inductance known to parameter
(8) and signal processing module, the signal processing module include power circuit control unit (2), switching frequency fsComputing unit
(4), duty ratio D computing unit (5), output voltage sampling unit (6), capacitance current trigger sampling unit (9), capacitor ESR and C
Computing unit (10)；
The Flyback converter main power circuit (1) includes input voltage source Vin, switching tube Qb, sustained diodeb, coupling
Inductance L, output filter capacitor and load RL, the output filter capacitor includes equivalent series resistance ESR and capacitor C, wherein opening
Close pipe QbDrain electrode and voltage source VinAnode connection, coupling inductance L primary side one end and switching tube QbDrain electrode connection, coupling electricity
Feel different name end and the sustained diode on the end pair side LbAnode connection, the coupling inductance L primary side other end and voltage source VinIt is negative
Pole connection, sustained diodebCathode respectively with one end of equivalent series resistance ESR and load RLOne end connection, equivalent string
The other end of connection resistance ESR is connect with one end of capacitor C, the other end and load R of capacitor CLThe other end with coupling inductance L
The Same Name of Ends on secondary side connects, and loads RLBoth ends are output average voltage Vo；
The input terminal of the power circuit control unit (2) the voltage source V with Flyback converter main power circuit (1) respectivelyin
With output average voltage VoConnection, the pwm signal of power circuit control unit (2) output end are respectively connected to switching frequency fsIt calculates
Unit (4) and duty ratio D computing unit (5), the output average voltage V of Flyback converter main power circuit (1)oIt accesses defeated
The pwm signal of amplifying unit (8) and power circuit control unit (2) output end is isolated in voltage sampling unit (6) out, Current Mutual Inductance
Access capacitance current triggering sampling unit (9), switching frequency fsComputing unit (4), duty ratio D computing unit (5), output electricity
Pressure sampling unit (6) and the output end of capacitance current triggering sampling unit (9) access capacitor ESR and C computing unit (10), electricity
The output end for holding ESR and C computing unit (10) accesses display unit (11)；
The input terminal of the driving circuit (3) is connect with the pwm signal of power circuit control unit (2) output end, driving circuit
(3) output end accesses switching tube QbGate pole.
2. the quasi- on-Line Monitor Device of CCM flyback converter output capacitance according to claim 1, which is characterized in that institute
Stating signal processing module is dsp chip TMS320F28335.
3. the quasi- on-Line Monitor Device of CCM flyback converter output capacitance according to claim 1, which is characterized in that institute
Stating display unit (11) is 1602 liquid crystal displays.
4. a kind of quasi- on-line monitoring method of CCM flyback converter output capacitance, which comprises the following steps:
Step 1, the capacitor (7) known to an output end upper parameter in parallel, creates power circuit control in signal processing module
Unit (2) processed, switching frequency fsComputing unit (4), duty ratio D computing unit (5), output voltage sampling unit (6), capacitor electricity
Stream triggering sampling unit (9), capacitor ESR and C computing unit (10)；
Step 2, power circuit control unit (2) acquisition Flyback converter main power circuit (1) of signal processing module is defeated
Average voltage V outoWith input voltage Vin, obtain pwm signal and through driving circuit (3) driving switch pipe Qb；
Step 3, the pwm signal of power circuit control unit (2) output is sent into switching frequency fsComputing unit (4) and duty ratio D meter
It calculates unit (5), through switching frequency fsComputing unit (4) processing obtains the current switching frequency f of converters, calculated through duty ratio D
Unit (5) processing obtains the current duty ratio D of converter；
Step 4, the output average voltage V of Flyback converter main power circuit (1)oIt is sent into output voltage sampling unit (6), obtains
To output average voltage；
Step 5, the capacitance current of the pwm signal of power circuit control unit (2) output and Current Mutual Inductance isolation amplifying unit (8)
ixIt is sent into capacitance current triggering sampling unit (9), handles to obtain the instantaneous value i of capacitance current by delay procedurex(DTs)、ix
[(1+9D)Ts/10]、ix[(2+8D)Ts/10]、ix[(3+7D)Ts/10]、ix[(4+6D)Ts/10]、ix[(5+5D)Ts/10]、ix
[(6+4D)Ts/10]、ix[(7+3D)Ts/10]、ix[(8+2D)Ts/10]、ix[(9+D)Ts/10]、ix(Ts) totally 11 value, TsFor
The converter switches period；
Step 6, the switching frequency f that will be obtaineds, duty ratio D, output average voltage VoAnd the instantaneous value i of capacitance currentx(DTs)、
ix[(1+9D)Ts/10]、ix[(2+8D)Ts/10]、ix[(3+7D)Ts/10]、ix[(4+6D)Ts/10]、ix[(5+5D)Ts/10]、
ix[(6+4D)Ts/10]、ix[(7+3D)Ts/10]、ix[(8+2D)Ts/10]、ix[(9+D)Ts/10]、ix(Ts) it is sent into capacitor ESR
It carries out curve fitting with C computing unit (10) and integrated treatment, it is currently equivalent to obtain output filter capacitor in Flyback converter
The value of series resistance ESR and capacitor C；
Step 7, the value of resulting equivalent series resistance ESR and capacitor C is sent by capacitor ESR and C computing unit (10) shows list
First (11) real-time display.
5. the quasi- on-line monitoring method of CCM flyback converter output capacitance according to claim 4, which is characterized in that step
The Fitting curve equation of ESR and C computing unit (10) described in rapid 6 should be as follows:
Acquire X1、X2、X3And iCx(0)；iCxIt (0) is the initial instantaneous value of capacitance current, t is the time；
It is as follows then according to the formula of ESR and C computing unit described in step 6 (10) integrated treatment:
In formula, ESR is the resistance value of equivalent series resistance, and C is the capacitance of capacitor, LsFor coupling inductance pair side inductance value, VoIt is flat to export
Equal voltage, resistance value of the ESRx for the equivalent series resistance of institute's shunt capacitance, capacitance of the Cx for institute's shunt capacitance, X1、X2、X3It is quasi-
Close the parameter of curve.
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| CN112710963A (en) * | 2020-12-28 | 2021-04-27 | 哈尔滨工业大学（深圳） | Switching power supply fault detection method based on pulse response |
| CN113219257A (en) * | 2021-04-29 | 2021-08-06 | 深圳市东昕科技有限公司 | Parameter measuring circuit of capacitor and ESR capacity measuring instrument of capacitor |
| CN113315372A (en) * | 2021-05-26 | 2021-08-27 | 南京矽力微电子技术有限公司 | Power converter |
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| CN111505524A (en) * | 2019-01-30 | 2020-08-07 | 台达电子工业股份有限公司 | On-line monitoring method of cascade converter and applicable cascade converter |
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| CN112710963A (en) * | 2020-12-28 | 2021-04-27 | 哈尔滨工业大学（深圳） | Switching power supply fault detection method based on pulse response |
| CN112710963B (en) * | 2020-12-28 | 2023-10-13 | 哈尔滨工业大学（深圳） | Switching power supply fault detection method based on impulse response |
| CN113219257A (en) * | 2021-04-29 | 2021-08-06 | 深圳市东昕科技有限公司 | Parameter measuring circuit of capacitor and ESR capacity measuring instrument of capacitor |
| CN113315372A (en) * | 2021-05-26 | 2021-08-27 | 南京矽力微电子技术有限公司 | Power converter |
| CN113315372B (en) * | 2021-05-26 | 2023-02-10 | 南京矽力微电子技术有限公司 | Power converter |
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| CN109142880B (en) | 2020-12-04 |
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